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HTML Author's Guide to the Robots META Tag [robotstxt.org]
I've not seen the nocache directive. Where did you find that one?
To prevent Googlebot from caching a page, you would use the noarchive directive.
Remove cached pages from Google [google.com]
Proper syntax for your example to do what it is I think you want to do would be...
<meta name="robots" content="noindex, nofollow">
<meta name="googlebot" content="noarchive"> You'll need two Robots META Tags. One generic one which covers all obedient bots and one specific one which covers googlebot and the caching issue.